check_uk_working_day
Use this when you need to know whether a 2024-2028 UK date is a Monday-Friday working day after applying the official bank holidays for the selected division. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this ...
This record as markdown: /tools/com-tttkmbb-calcgrid/check-uk-working-day.md
What check_uk_working_day does on Calcgrid
AI agents call check_uk_working_day to retrieve information from Calcgrid without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
date | string | Yes | UK civil date in YYYY-MM-DD format, within 2024-2028. |
division | string | — | GOV.UK bank-holiday division. England and Wales share one official list; Scotland and Northern Ireland have separate lists. |
Parameters from the server's own tool schema.
Why check_uk_working_day is rated Low
Even though check_uk_working_day only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs check_uk_working_day safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Calcgrid, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For check_uk_working_day, this is the rule to start with:
check_uk_working_day is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Calcgrid, apply this rule, and every check_uk_working_day call is checked against it from then on.
Questions about check_uk_working_day
Use this when you need to know whether a 2024-2028 UK date is a Monday-Friday working day after applying the official bank holidays for the selected division. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when you need a local council, school, employer, financial-market, emergency-closure or non-UK calendar, or a date outside 2024-2028. What it computes: Checks whether a date is a normal working day in England and Wales, Scotland or Northern Ireland using a pinned snapshot of the official GOV.UK bank-holiday feed. Example user requests: Is 28 December 2026 a working day in England and Wales, or the Boxing Day substitute holiday? | Is Scotland working on 15 June 2026? | Check whether 13 July 2026 is a working day in Northern Ireland. Inputs: date (date); division (enum, optional). Complete JSON argument examples: {"date":"2026-12-28","division":"england-and-wales"} | {"date":"2026-06-15","division":"scotland"} Outputs: date, weekday, division, division_name, is_working_day, day_type, bank_holiday_name, bank_holiday_notes, status_basis, source_url, licence, dataset_version, coverage_start, coverage_end, source_snapshot_sha256. Formula: official bank-holiday event → non-working; else Saturday/Sunday → non-working; else Monday-Friday → working Direct REST fallback: POST https://tttkmbb.com/api/v1/calculate/uk-working-day with the same JSON input fields. Do not guess another /api/* path. Docs: https://tttkmbb.com/everyday/uk-working-day.md. It is categorised as a Read tool in the Calcgrid MCP Server, which means it retrieves data without modifying state.
check_uk_working_day accepts 2 parameters: date, division. Required: date. The full parameter table on this page comes from the server's own tool schema.
Register the Calcgrid MCP server in PolicyLayer and add a rule for check_uk_working_day: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Calcgrid. Nothing to install.
check_uk_working_day is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the check_uk_working_day rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for check_uk_working_day. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
check_uk_working_day is provided by the Calcgrid MCP server (https://tttkmbb.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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